electrumitic acid - a liquid with high damage per second...
you can place items in it and it may destroy them, or it may infuse them with electrum... making them powerful in specific ways
It moves around horizantally and down if it can, flowing away.

giant electrumite crystals... decor or can be ground into electrumite dust

electrumite dust can be crafted or cooked into electrum orbs (or maybe another mechanic to do it)

electrum orbs can be crafted somehow into electrum blocks.

electrum dust can make elecrumitic with water

many mobs like electrumitic acid... it helps mobs but hurts players (damage per sec).

electrum ores and crystals can spawn around electrum pillars. This has a higher concentration of electrum, and is a hotspot for fighting mobs

electrum wells are where electrumitic acid spawns and despawns occasionally.